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+//Example 1.8.<i>
+//Sketch the following signal
+clc;
+clear all;
+t=-10:.001:10;
+for i=1:length(t)
+    if t(i)>=-2 & t(i)<3 then
+        x(i)=1;
+    else
+        x(i)=0;
+    end
+end
+//figure
+f=scf(0);
+plot2d(t,x);
+xtitle('Required figure','t','x(t)');
+xs2jpg(0, 'EX1_8_1-plot.jpg');
+//Example 1.8.<ii>
+//Sketch the following signal.
+clc;
+clear all;
+t=-10:.001:10;
+for i=1:length(t)
+    if t(i)>=0 & t(i)<=2 then
+        x(i)=1;
+    else
+        x(i)=0;
+    end
+end
+//figure
+f=scf(0);
+plot2d(t,x,1);
+xtitle('Required figure','t','x(t)');
+xs2jpg(0, 'EX1_8_2-plot.jpg');
+
+
+